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Takahashi, Toshitake,Nichols, Patricia,Takei, Kuniharu,Ford, Alexandra C,Jamshidi, Arash,Wu, Ming C,Ning, C Z,Javey, Ali IOP Pub 2012 Nanotechnology Vol.23 No.4
<P>Spatially composition-graded CdS<SUB>x</SUB>Se<SUB>1−x</SUB> (x = 0–1) nanowires are grown and transferred as parallel arrays onto Si/SiO<SUB>2</SUB> substrates by a one-step, directional contact printing process. Upon subsequent device fabrication, an array of tunable-wavelength photodetectors is demonstrated. From the spectral photoconductivity measurements, the cutoff wavelength for the device array, as determined by the bandgap, is shown to cover a significant portion of the visible spectrum. The ability to transfer a collection of crystalline semiconductor nanowires while preserving the spatially graded composition may enable a wide range of applications, such as tunable lasers and photodetectors, efficient photovoltaics, and multiplexed chemical sensors.</P>